Review
Geography, Physical
Jaia Syvitski, Edward Anthony, Yoshiki Saito, Florin Zainescu, John Day, Janok P. Bhattacharya, Liviu Giosan
Summary: Deltas are subaerial landforms formed by rivers depositing sediment into standing bodies of water. They are environmentally complex and influenced by natural conditions, sediment input, redistribution processes, and human actions. Deltas play a significant role in terms of their size, ecological importance, and human population.
GLOBAL AND PLANETARY CHANGE
(2022)
Article
Engineering, Marine
Qian Zhang, Chunyan Li, Wei Huang, Jun Lin, Matthew Hiatt, Victor H. Rivera-Monroy
Summary: This study evaluates the spatiotemporal patterns of water circulation induced by six atmospheric cold front events in the Wax Lake Delta region using a 3-D hydrodynamic model. The results show that cold fronts significantly impact channelized and inter-distributary water flow, as well as landward flow and storm surge on the coast. The magnitude and duration of the flushing events vary, and the wind associated with cold fronts is the main driver of water circulation in the region.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Geography, Physical
A. Rodriguez-Gonzalez, J. L. Fernandez-Turiel, M. Aulinas, M. C. Cabrera, C. Prieto-Torrell, G. A. Rodriguez, H. Guillou, F. J. Perez-Torrado
Summary: This study analyzes the volcanic rocky coast setting and assesses the effects of volcanic construction and erosion on the coast at the scale of a volcanic edifice. El Hierro Island exemplifies an active sea-cliff profile, reflecting its early evolutionary stage as a young ocean volcanic island. The age of eruptions forming lava deltas affecting the coastal landform was constrained using a contemporary insular shelf. The study provides valuable insights for coastal planning and volcanic risk assessment.
Article
Geosciences, Multidisciplinary
H. E. Glover, A. S. Ogston, A. T. Fricke, C. A. Nittrouer, C. Aung, T. Naing, E. J. Lahr
Summary: Effective coastal management requires a fundamental understanding of the impacts of anthropogenic activities on sediment dynamics. In this study, the relative resilience to subsidence was compared between an agricultural field and a nearby mangrove-forest preserve in the Ayeyarwady Delta, Myanmar. The results showed that both sites had net sediment import due to vegetation trapping, and the relative elevations were equivalent, suggesting similar aggradation rates. Unleveed fields may be less vulnerable to subsidence than leveed fields, but the decision to replace mangroves with agricultural fields should consider all the benefits provided by each environment.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Environmental Sciences
J. van Engelen, G. H. P. Oude Essink, M. F. P. Bierkens
Summary: Population growth, urbanization, and intensification of irrigated agriculture in deltas around the world have increased the demand for fresh water, leading to extensive groundwater extraction. This extraction has resulted in saltwater intrusion and the depletion of fresh groundwater resources, posing a threat to freshwater and food security.
ENVIRONMENTAL RESEARCH LETTERS
(2022)
Review
Environmental Sciences
Julia A. Cantelon, Julia A. Guimond, Clare E. Robinson, Holly A. Michael, Barret L. Kurylyk
Summary: With rising sea levels and increased frequency and intensity of storms, low-elevation coastal areas are at an increasing risk of seawater flooding. This flooding can lead to the salinization of coastal aquifers through vertical saltwater intrusion. However, vertical saltwater intrusion is often overlooked in coastal zone assessments. This review synthesizes previous studies on vertical saltwater intrusion and highlights the need for improved understanding, coordination, and education in addressing the vulnerability of coastal groundwater.
WATER RESOURCES RESEARCH
(2022)
Review
Environmental Sciences
Irina Overeem, Jaap H. Nienhuis, Anastasia Piliouras
Summary: Arctic deltas are ice-dominated systems that are influenced by land ice, permafrost, and sea ice. They are highly seasonal and frozen for most of the year. The sediment and carbon fluxes in Arctic deltas are lower compared to deltas in lower latitudes, and their morphodynamics are also subdued. Climate change will cause Arctic deltas to transition away from ice dominance, leading to unknown consequences for their morphodynamics and carbon cycling.
NATURE REVIEWS EARTH & ENVIRONMENT
(2022)
Article
Biochemistry & Molecular Biology
Evgenii Igorevich Mareev, Alexander Petrovich Sviridov, Vyacheslav Mihailovich Gordienko
Summary: Using molecular dynamics simulation, three Widom δ regions were identified in the p-T diagram of a mixture of carbon dioxide and ethanol, characterized by high-density fluctuations and anomalous behavior of thermodynamic parameters. These regions are attributed to the formation of large mixed linear clusters, with two corresponding to pure supercritical carbon dioxide and ethanol, and the third located near the critical point of the binary mixture.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)
Article
Environmental Sciences
Zhaohui Liu, Yao Du, Yamin Deng, Yanwen Huang, Xinwen Zhao, Qinghua Li
Summary: This study aims to characterize the occurrence, sources, and enrichment mechanisms of geogenic phosphorus (P) in a coastal confined aquifer system of the Pearl River Delta, southern China. The study found that intense degradation of P-containing organic matter in a reducing environment with abundant organic matter produced high concentrations of geogenic P. The enrichment of P in groundwater was mainly associated with specific organic compounds. Different types of dissolved organic phosphorus (DOP) can be mineralized into P, and the newly synthesized organic P compounds by marine microorganisms contribute to the continuous enrichment of P in the aquifer system. This study provides new insights into subsurface P cycling in coastal aquatic systems.
Article
Engineering, Civil
Roberto Poncela, Juan C. Santamarta, Alejandro Garcia-Gil, Noelia Cruz-Perez, Elzbieta Skupien, Javier Garcia-Barba
Summary: Aquifers are vital sources of freshwater on oceanic islands. With growing demographic and climatic changes, it is crucial to maintain groundwater quantity and quality. However, assessing water resources on islands with heterogeneous volcanic aquifers is challenging. This study proposes an approach using recession coefficients from deep water gallery discharge to improve the hydrogeological characterization of these systems. By evaluating hydrographs and recession curves from groundwater discharge on La Palma, the main hydrogeological parameters of the volcanic aquifer system were obtained. The methodology has proven useful in addressing local uncertainties in hydraulic characterization and provides valuable information for water management planning.
JOURNAL OF HYDROLOGY
(2022)
Article
Environmental Sciences
Tristan McKenzie, Henrietta Dulai, Jonghyun Lee, Natasha T. Dimova, Isaac R. Santos, Bo Zhang, William Burnett
Summary: This study utilizes deep learning to predict radon concentrations in coastal waters impacted by submarine groundwater discharge. By training two deep learning models, it is possible to predict observed radon concentrations using readily available input parameters, offering an opportunity to obtain radon data in regions with limited data availability.
WATER RESOURCES RESEARCH
(2023)
Article
Geosciences, Multidisciplinary
Gerard Salter, Michael P. Lamb
Summary: Understanding the factors that determine the size and stability of deltaic islands is crucial for predicting their response to rising sea levels. This study found that secondary channels can stabilize islands and that they can respond to sea level rise through morphodynamic feedbacks.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Environmental Sciences
A. M. Anderson, D. M. Allen, J. G. Venditti
Summary: The amount of fresh water in coastal deltas is controlled by subsurface structures. This study explores the range of subsurface permeability and hydraulic gradient in three types of deltas (fluvial, wave, and tidal) using morphodynamic models. The results show that deltaic landforms have a median permeability of 4.0 x 10-12 m2, an average hydraulic gradient of 3.9 x 10-4, and a mean specific discharge of 1.3 x 10-8 m/s. The study also finds that high permeability bodies are associated with channelization and that morphodynamic influences and geomorphic characteristics have a significant impact on the subsurface permeability and connectivity.
WATER RESOURCES RESEARCH
(2023)
Article
Engineering, Environmental
Yao Du, Yamin Deng, Zhaohui Liu, Yanwen Huang, Xinwen Zhao, Qinghua Li, Teng Ma, Yanxin Wang
Summary: This study investigated the mechanisms underlying the high geogenic ammonium levels in the coastal confined aquifer system of the Pearl River Delta by characterizing DOM optical and molecular signatures, as well as multiple isotopes. The processing pathway of DOM components and the gradual enrichment of ammonium due to decomposition were identified, leading to the retention of produced ammonium in the aquifer. The contrasting DOM characteristics and differing hydrogeological conditions contribute to the higher geogenic ammonium levels in coastal aquifer systems compared to inland systems.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Meteorology & Atmospheric Sciences
Hanqing Kang, Bin Zhu, Xiaohui Liu, Shuangshuang Shi, Xuewei Hou, Wen Lu, Shuqi Yan, Chen Pan, Yu Chen
Summary: This study found that most haze events in the Yangtze River Delta in autumn and winter were associated with cold frontal passages. During cold front episodes, the transport of PM2.5 mass from the North China Plain was 10-15 times higher compared to noncold front periods. Both unmanned aerial vehicle sounding and model simulation indicated a stronger and faster upper-level transport of PM2.5 than at ground level during cold front passage.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2021)
Article
Geosciences, Multidisciplinary
Wayne Wagner, Dimitri Lague, David Mohrig, Paola Passalacqua, John Shaw, Kevan Moffett
GEOPHYSICAL RESEARCH LETTERS
(2017)
Article
Environmental Sciences
Allan E. Jones, Ben R. Hodges, James W. McClelland, Amber K. Hardison, Kevan B. Moffett
WATER RESOURCES RESEARCH
(2017)
Article
Agronomy
Gerald F. M. Page, Jean F. Lienard, Matthew J. Pruett, Kevan B. Moffett
AGRICULTURAL AND FOREST METEOROLOGY
(2018)
Article
Environmental Sciences
Kevan B. Moffett, Yasuyo Makido, Vivek Shandas
Article
Environmental Sciences
Julia A. Guimond, Angelia L. Seyfferth, Kevan B. Moffett, Holly A. Michael
ENVIRONMENTAL RESEARCH LETTERS
(2020)
Article
Multidisciplinary Sciences
Allan E. Jones, Amber K. Hardison, Ben R. Hodges, James W. McClelland, Kevan B. Moffett
Article
Plant Sciences
A. D. Jayakaran, K. B. Moffett, J. C. Padowski, P. A. Townsend, B. Gaolach
URBAN FORESTRY & URBAN GREENING
(2020)
Article
Environmental Sciences
Allan E. Jones, Amber K. Hardison, Ben R. Hodges, James W. McClelland, Kevan B. Moffett
WATER RESOURCES RESEARCH
(2020)
Article
Environmental Sciences
Xin Xu, Hengchen Wei, Grayson Barker, Kylie Holt, Spyder Julian, Tricia Light, Sierra Melton, Ana Salamanca, Kevan B. Moffett, James W. McClelland, Amber K. Hardison
Summary: This study quantified organic matter decomposition rates in surface sediment layers in two south Texas river channels, finding that oxygen consumption rates in TFZ sediments were primarily controlled by organic matter content and temperature. Additionally, sediment organic matter in TFZs was predominantly composed of algal biomass from in situ production.
ESTUARIES AND COASTS
(2021)
Article
Ecology
Sebastian U. Busby, Kevan B. Moffett, Andres Holz
Article
Ecology
John M. Romansic, Nicolette L. Nelson, Kevan B. Moffett, Jonah Piovia-Scott
Summary: Land managers are increasingly using beavers to restore hydrological function and provide wildlife habitat. Research in the southern Washington Cascade Range found that amphibian species richness was significantly higher in dammed sites compared to undammed sites, with species like red-legged frogs and northwestern salamanders being almost exclusively found in beaver-dammed sites. These results suggest that beavers could have a positive impact on aquatic wildlife populations and ecosystem health.
FRESHWATER BIOLOGY
(2021)
Review
Geochemistry & Geophysics
Pei Xin, Alicia Wilson, Chengji Shen, Zhenming Ge, Kevan B. Moffett, Isaac R. Santos, Xiaogang Chen, Xinghua Xu, Yvonne Y. Y. Yau, Willard Moore, Ling Li, D. A. Barry
Summary: Salt marshes are important ecosystems that provide essential ecological services, but they have been lost globally due to human activities and climate change. The interactions between tidal water and groundwater in salt marshes affect plant growth and biogeochemical exchange with coastal water. However, there are still significant knowledge gaps regarding the hydrological and ecological links in salt marshes and the challenges they face.
REVIEWS OF GEOPHYSICS
(2022)
Article
Environmental Sciences
Hengchen Wei, Xin Xu, Allan E. Jones, Amber K. Hardison, Kevan B. Moffett, James W. McClelland
Summary: This study sheds light on the role of tidal freshwater zones (TFZs) in modifying the timing and forms of nitrogen (N) inputs to estuaries. The research found that median concentrations of dissolved inorganic N (DIN) were lower in TFZs compared to upstream non-tidal river reaches, and exhibited spatial gradients. The forms of N also changed within TFZs, with DIN transforming into organic N. Comparisons of discharge and N flux in the Aransas River TFZ showed that tidal patterns influenced the timing of N export, with export exceeding input in winter and being relatively balanced in summer.
ESTUARIES AND COASTS
(2022)
Article
Ecology
Brittany E. Pugh, Megan Colley, Stephen J. Dugdale, Patrick Edwards, Rebecca Flitcroft, Andres Holz, Matthew Johnson, Michela Mariani, Mickey Means-Brous, Kate Meyer, Kevan B. Moffett, Lisa Renan, Franziska Schrodt, Colin Thorne, Samuel Valman, Upekala Wijayratne, Richard Field
Summary: Historically, wildfires have significantly impacted landscape-scale disturbances and enhanced biodiversity through generating temporally and spatially heterogeneous mosaics of wildfire severity and post-burn recovery. However, river management practices have often disconnected rivers from their floodplains, reducing biodiversity and increasing the likelihood of deep, uniform burns. By focusing on floodplain re-wetting and restoration, river management can reduce wildfire intensity and enhance biodiversity, contributing to climate-change resilience.
GLOBAL ECOLOGY AND BIOGEOGRAPHY
(2022)
Article
Environmental Sciences
Richard A. Norton, John A. Harrison, C. Kent Keller, Kevan B. Moffett
Article
Engineering, Civil
Arfan Arshad, Ali Mirchi, Javier Vilcaez, Muhammad Umar Akbar, Kaveh Madani
Summary: High-resolution, continuous groundwater data is crucial for adaptive aquifer management. This study presents a predictive modeling framework that incorporates covariates and existing observations to estimate groundwater level changes. The framework outperforms other methods and provides reliable estimates for unmonitored sites. The study also examines groundwater level changes in different regions and highlights the importance of effective aquifer management.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Lihua Chen, Jie Deng, Wenzhe Yang, Hang Chen
Summary: A new grid-based distributed karst hydrological model (GDKHM) is developed to simulate streamflow in the flood-prone karst area of Southwest China. The results show that the GDKHM performs well in predicting floods and capturing the spatial variability of karst system.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Faruk Gurbuz, Avinash Mudireddy, Ricardo Mantilla, Shaoping Xiao
Summary: Machine learning algorithms have shown better performance in streamflow prediction compared to traditional hydrological models. In this study, researchers proposed a methodology to test and benchmark ML algorithms using artificial data generated by physically-based hydrological models. They found that deep learning algorithms can correctly identify the relationship between streamflow and rainfall in certain conditions, but fail to outperform traditional prediction methods in other scenarios.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Yadong Ji, Jianyu Fu, Bingjun Liu, Zeqin Huang, Xuejin Tan
Summary: This study distinguishes the uncertainty in drought projection into scenario uncertainty, model uncertainty, and internal variability uncertainty. The results show that the estimation of total uncertainty reaches a minimum in the mid-21st century and that model uncertainty is dominant in tropical regions.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Z. R. van Leeuwen, M. J. Klaar, M. W. Smith, L. E. Brown
Summary: This study quantifies the effectiveness of leaky dams in reducing flood peak magnitude using a transfer function noise modelling approach. The results show that leaky dams have a significant but highly variable impact on flood peak magnitude, and managing expectations should consider event size and type.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Zeda Yin, Yasaman Saadati, M. Hadi Amini, Linlong Bian, Beichao Hu
Summary: Combined sewer overflows pose significant threats to public health and the environment, and various strategies have been proposed to mitigate their adverse effects. Smart control strategies have gained traction due to their cost-effectiveness but face challenges in balancing precision and computational efficiency. To address this, we propose exploring machine learning models and the inversion of neural networks for more efficient CSO prediction and optimization.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Qimou Zhang, Jiacong Huang, Jing Zhang, Rui Qian, Zhen Cui, Junfeng Gao
Summary: This study developed a N-cycling model for lowland rural rivers covered by macrophytes and investigated the N imports, exports, and response to sediment dredging. The findings showed a considerable N retention ability in the study river, with significant N imports from connected rivers and surrounding polders. Sediment dredging increased particulate nitrogen resuspension and settling rates, while decreasing ammonia nitrogen release, denitrification, and macrophyte uptake rates.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Xue Li, Yingyin Zhou, Jian Sha, Man Zhang, Zhong-Liang Wang
Summary: High-resolution climate data is crucial for predicting regional climate and water environment changes. In this study, a two-step downscaling method was developed to enhance the spatial resolution of GCM data and improve the accuracy for small basins. The method combined medium-resolution climate data with high-resolution topographic data to capture spatial and temporal details. The downscaled climate data were then used to simulate the impacts of climate change on hydrology and water quality in a small basin. The results demonstrated the effectiveness of the downscaling method for spatially differentiated simulations.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Tongqing Shen, Peng Jiang, Jiahui Zhao, Xuegao Chen, Hui Lin, Bin Yang, Changhai Tan, Ying Zhang, Xinting Fu, Zhongbo Yu
Summary: This study evaluates the long-term interannual dynamics of permafrost distribution and active layer thickness on the Tibetan Plateau, and predicts future degradation trends. The results show that permafrost area has been decreasing and active layer thickness has been increasing, with an accelerated degradation observed in recent decades. This has significant implications for local water cycle processes, water ecology, and water security.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Chi Zhang, Xu Zhang, Qiuhong Tang, Deliang Chen, Jinchuan Huang, Shaohong Wu, Yubo Liu
Summary: Precipitation over the Tibetan Plateau is influenced by systems such as the Asian monsoons, the westerlies, and local circulations. The Indian monsoon, the westerlies, and local circulations are the main systems affecting precipitation over the entire Tibetan Plateau. The East Asian summer monsoon primarily affects the eastern Tibetan Plateau. The Indian monsoon has the greatest influence on precipitation in the southern and central grid cells, while the westerlies have the greatest influence on precipitation in the northern and western grid cells. Local circulations have the strongest influence on the central and eastern grid cells.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Manuel Almeida, Antonio Rodrigues, Pedro Coelho
Summary: This study aimed to improve the accuracy of Total Phosphorus export coefficient models, which are essential for water management. Four different models were applied to 27 agroforestry watersheds in the Mediterranean region. The modeling approach showed significant improvements in predicting the Total Phosphorus diffuse loads.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Yutao Wang, Haojie Yin, Ziyi Wang, Yi Li, Pingping Wang, Longfei Wang
Summary: This study investigated the distribution and transformation of dissolved organic nitrogen (DON) in riverbed sediments impacted by effluent discharge. The authors found that the spectral characteristics of dissolved organic matter (DOM) in surface water and sediment porewater could be used to predict DON variations in riverbed sediments. Random forest and extreme gradient boosting machine learning methods were employed to provide accurate predictions of DON content and properties at different depths. These findings have important implications for wastewater discharge management and river health.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Saba Mirza Alipour, Kolbjorn Engeland, Joao Leal
Summary: This study assesses the uncertainty associated with 100-year flood maps under different scenarios using Monte Carlo simulations. The findings highlight the importance of employing probabilistic approaches for accurate and secure flood maps, with the selection of probability distribution being the primary source of uncertainty in precipitation.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Janine A. de Wit, Marjolein H. J. van Huijgevoort, Jos C. van Dam, Ge A. P. H. van den Eertwegh, Dion van Deijl, Coen J. Ritsema, Ruud P. Bartholomeus
Summary: The study focuses on the hydrological consequences of controlled drainage with subirrigation (CD-SI) on groundwater level, soil moisture content, and soil water potential. The simulations show that CD-SI can improve hydrological conditions for crop growth, but the success depends on subtle differences in geohydrologic characteristics.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Constantin Seidl, Sarah Ann Wheeler, Declan Page
Summary: Water availability and quality issues will become increasingly important in the future due to climate change impacts. Managed Aquifer Recharge (MAR) is an effective water management tool, but often overlooked. This study analyzes global MAR applications and identifies the key factors for success, providing valuable insights for future design and application.
JOURNAL OF HYDROLOGY
(2024)